other:python:misc_by_jyp
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| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
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other:python:misc_by_jyp [2021/07/06 09:17] jypeter Cleaned |
other:python:misc_by_jyp [2021/07/06 11:49] jypeter [Using command-line arguments] added getopt, optparse and argparse |
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| Line 38: | Line 38: | ||
| >>> os.access('/home/jypmce/.bashrc', os.W_OK) | >>> os.access('/home/jypmce/.bashrc', os.W_OK) | ||
| True</code> | True</code> | ||
| + | |||
| + | ==== Using command-line arguments ==== | ||
| + | |||
| + | === The extremely easy but non-flexible way: sys.argv === | ||
| + | |||
| + | The name of a script, the number of arguments (including the name of the script), and the arguments (as strings) can be accessed through the ''sys.argv'' strings' list | ||
| + | |||
| + | Simple ''argv_test.py'' test script: | ||
| + | <code>#!/usr/bin/env python | ||
| + | import sys | ||
| + | nb_args = len(sys.argv) | ||
| + | print('Number of script arguments (including script name) =', nb_args) | ||
| + | for idx, val in enumerate(sys.argv): | ||
| + | print(idx, val)</code> | ||
| + | |||
| + | <code>$ python argv_test.py | ||
| + | Number of script arguments (including script name) = 1 | ||
| + | 0 argv_test.py | ||
| + | |||
| + | $ python argv_test.py tas tas_tes.nc | ||
| + | Number of script arguments (including script name) = 3 | ||
| + | 0 argv_test.py | ||
| + | 1 tas | ||
| + | 2 tas_tes.nc</code> | ||
| + | |||
| + | === The C-style way: getopt === | ||
| + | |||
| + | Use [[https://docs.python.org/3/library/getopt.html|getopt]] (//C-style parser for command line options//) | ||
| + | |||
| + | === The deprecated Python way: optparse === | ||
| + | |||
| + | [[https://docs.python.org/3/library/optparse.html|optparse]] (//parser for command line options//) is **deprecated since Python version 3.2**! You should now use argparse (check [[https://docs.python.org/3/library/argparse.html#upgrading-optparse-code|Upgrading optparse code]] for converting from ''optparse'' to ''argparse'') | ||
| + | |||
| + | === The current Python way: argparse === | ||
| + | |||
| + | [[https://docs.python.org/3/library/argparse.html|argparse]] (//parser for command-line options, arguments and sub-commands//) is available since Python version 3.2 | ||
| /* | /* | ||
other/python/misc_by_jyp.txt · Last modified: 2024/04/19 12:02 by jypeter
